Received the Motorola DOCSIS 3.1 cable modem on-time from Amazon. Up and running within 15 minutes, No call to Comcast.
Motorola Ultra Fast DOCSIS 3.1 Cable Modem, Model MB8600, plus 32x8 DOCSIS 3.0, Certified by Comcast XFINITY
Paper instructions were in the box and also online. No firmware available for prior update. I had previously confirmed that this device is acceptable to Comcast. Before buying any network device, always check that your ISP supports the device you plan to buy. Unacceptable for us to rate an item poorly if its is not compatible with your stuff...
I replaced a Cisco - Linksys model DPC3008 DOCSIS 3.0 cable modem purchased thru Amazon for $90 exactly five years ago. It has never failed. I would have paid Comcast say $10 / month to lease their inferior modem for the last 60 months, using the roughly $510 savings to enjoy Comcast "Blast" speeds not supported by their leased modem. I viewed this purchase as another future-proof, leading edge decision to replace a 5-year old $90 device. I did not expect a speed increase. Here is why.
If I log into my Comcast account and search for upgrades for my Internet service, there is only a fiber option. I am maxed out at a supported wire speed of "150 mbps". I attained that with the 5-year old DOCSIS 3.0 device. So, Comcast does not yet offer DOCSIS 3.1 service here; and, they will not reveal that to customers. I searched for a couple of hours for that revelation. The new MB8600 has a connect LED the turns blue with a 3.1 connection else stays green to confirm 3.0 per the instructions. Mine is green now. So, "NO", Comcast has not brought DOCSIS 3.1 to my area.
Follow the instructions. They work. I suggest however that you perform a broadband speed test prior to switching out your old cable modem. I also suggest you have your Comcast account number from a bill and ensure your Comcast account has your current phone number. NOT clearly said; but, I also suggest that you eliminate your network's switches / routers / Wi-Fi and simply Ethernet connect to any one of the four gigabit Ethernet ports on the back of the MB8600. I used port one.
The MB8600 synced up with Comcast quickly (according to the lights); but, I could not obtain an Internet connection. I'm guessing Windows 10 Pro simply was trying to protect me from a new intrusion. This is not a Windows 10 / Microsoft Edge issue. Solution: delete all network settings, reboot and there it was, Comcast activate. Enter your data and your MB8600 will reset. Once completed, I was online within 15 minutes. But, the speeds I had before were faster than now. Guess that my firmware had not yet been updated by Comcast.
The label on the bottom of the MB8600 has an IP address, user name and password. I logged in and saw that the modem had provisioned to DOCSIS 3.0 with only one channel down and three channels up, far below its capacity in 3.0. You resolve this by pressing in the RESET button on the back of the MB8600 for several seconds till the lights flash. After, I now have 24 channels down and three channels up. I then retested my speeds to confirm that I was exceeding the Comcast Extreme 150 service level I am paying for: 180 mbps down / 24 up. That is a roughly 10% improvement still on DOCSIS 3.0. Again, Comcast here does not seem to support any faster wired speed than 150 mbps, and deeper level of DOCSIS 3.0 than 24X3 and no DOCSIS 3.1, now, no DOCSIS 3.0 32x4 either. I can hope but AOL is perceived as "high tech" here...
I hate contacting Comcast customer service since I always feel as if I am training them. I may invest the day it will likely take to get Comcast to remotely re-provision my interface with them. Maybe not.
Satisfied that I was connected as well as I could, I then moved on to reconnect my router for its Wi-Fi and more importantly for its added Trend Micro security not offered by the MB8600 since it is not a router, its a cable modem. My configuration is MB8600 to an Asus router with 4 gigabit ports and Wi-Fi AC2400. One wired port feeds a dumb Gigabit switch supporting five devices. A second wired port supports my Microsoft Book. I'm a retired IT guy so I avoid wireless connections excepting my cell.
Yes, I have my cable modem, router and PC powered thru an uninterruptable power supply. The MB8600 documentation states that its power supply is resistant to power surges. We have afternoon storms all summer. Its fun to continue surfing while neighbors are dark; yet, my Comcast and DirecTV both work fine with a UPS power supply. Good that Motorola upgraded to some surge protection; but, I want that and sine wave continuous power. For your consideration....
The MB8600 has been connected for roughly six hours. It is barely warm and only at its top. Off to a good start.
UPDATE JUL2018: The MB8600 is still running like a champ. No issues. Comcast finally has some competition from Century Link with its fiber optic Gigabit offering wired into my neighborhood just days before hurricane Irma. I signed up for it since its cost was just a minor bump for gigabit from 150 mbps. A few months ago, the green DOCSIS icon turned from green to blue indicating that Comcast had turned on version 3.1 but; I was provisioned for 150 Mbps and did not see a speed jump. Nine months later, still no Century Link offer.
Regardless, I opted to move to a different home. Unfortunately an older neighborhood with no Century Link fiber optic. But Comcast does offer Gigabit speed at a higher price. Comcast's cables here are 30 to 40 years old unfortunately.
I've been with Comcast for well more than 8 years. This was the first move / install that was completed correctly the first time. The tech clocked 960 Mbps at the MB8600 down. My PC sees less speed (580 to 870 down) with a reliable 40 Mbps up. The MB8600 performs as advertised. All 32 downstream channels and 4 upstream channels are locked.
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Motorola 24x8 Cable Modem, Model MB7621, DOCSIS 3.0. Approved by Comcast Xfinity, Cox, Charter Spectrum, Time Warner Cable, and More. Downloads 1,000 Mbps Maximum (No WiFi) (Renewed) $49.99 & FREE Shipping. Details
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Works and looks like new and backed by the Amazon Renewed Guarantee
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Works and looks like new and backed by the Amazon Renewed Guarantee
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This Item  Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and Spectrum | for Cable Plans Up to 900 Mbps | DOCSIS 3.0 |  |  |  |  | |
| Price | $109.91 | $99.99 | -35% $129.99 New Price: $201.15 | $57.39 | -10% $197.99 List: $219.99 |
| Delivery | — | Get it as soon as Thursday, May 16 | Get it as soon as Thursday, May 16 | Get it as soon as Thursday, May 16 | — |
| Customer Ratings | |||||
| Easy to install | |||||
| WiFi signal | |||||
| Tech Support | |||||
| Value for money | |||||
| Sold By | Discount Seller Direct | Hitron Americas | Motorola Networking Renewed | Abe's Electronics Center | Amazon.com |
| connectivity tech | Ethernet | Ethernet | Wi-Fi | Wired | Ethernet |
| ethernet ports | 1 | 2 | 4 | 1 | 2 |
| number of ports | 1 | 2 | 4 | 8 | 2 |
| data transfer rate | 1000 megabits per second | 1 gigabits per second | 1 gigabits per second | 680 megabits per second | 2500 megabits per second |
| max downstream rate | 1000 megabits per second | 1000 megabits per second | 1000 megabits per second | 343 megabits per second | 2500 megabits per second |
| max upstream rate | — | 350 megabits per second | 1000 megabits per second | 123 megabits per second | 2.5 gigabits per second |
| modem type | cellular | cable | cable | cable | cable |
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Setting Up The Motorola MB8611 DOCSIS 3.1 Cable Modem
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Excellent Alternative to ISP Provided Modem
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Product Description
The smart choice for your cable Internet service
Eliminate monthly cable modem rental fees – Typically saves 168 dollars per year in Xfinity cable modem rental fees. Actual savings depend on your service provider.
800+ Mbps – Maximum actual Internet download speed
GigE Ethernet port – For a high-speed wired connection to any router, computer, or other Internet-capable device.
Connect any WiFi router you choose
Plugs easily into any router for shared Internet access by all your WiFi and Ethernet-capable devices. This flexible approach lets you pair this cable modem with any router you choose for your WiFi needs, including a mesh router or gaming router.
If the MB7621’s Ethernet port isn’t used for a router, it can plug into a computer, HDTV, game station, or other Ethernet device.
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Compatible with Most Cable ProvidersCertified by Comcast Xfinity, Cox, Charter Spectrum, and other cable providers. * Not compatible with Verizon, AT&T, CenturyLink, and other fiber optic, satellite, or DSL services. |
Fast Internet SpeedConnects fast with just 3 connections - power, coax cable, and Ethernet. |
Supports internet plans with speeds up to 900 MbpsFor other service providers, supported service speeds are similar to Comcast. |
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| MB7220 | MB7420 | MB7621 | MB8600 | MB8611 | |
| Customer Reviews |
4,313
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6,317
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28,920
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28,920
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28,920
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| Price | $96.00 | $59.95 | $109.91 | $179.99 | $158.00 |
| Product Type (This table only includes cable modems with NO built-in WiFi router) | 8x4 Cable Modem | 16x4 Cable Modem | 24x8 Cable Modem | DOCSIS 3.1 plus 32x8 3.0 Cable Modem | DOCSIS 3.1 plus 32x8 3.0 Cable Modem |
| DOCSIS Channel Bonding | 8x4 DOCSIS 3.0 | 16x4 DOCSIS 3.0 | 24x8 DOCSIS 3.0 | DOCSIS 3.1 plus 32x8 DOCSIS 3.0 | DOCSIS 3.1 plus 32x8 DOCSIS 3.0 |
| Certified for These Cable Internet Services. Typically Works with Many Others. | Comcast Xfinity, Cox, Spectrum, Sparklight (CableOne), WOW! | Comcast Xfinity, Cox, Spectrum, Suddenlink, Sparklight (CableOne) | Comcast Xfinity, Cox, Spectrum, Suddenlink, Sparklight (CableOne) | Comcast Xfinity, Cox | Comcast Xfinity, Cox |
| Recommended by Comcast Xfinity for Internet Service This Speed Tier or Below | 200 Mbps | 300 Mbps | 800 Mbps | 1000 Mbps | 2500 Mbps |
| Maximum Internet Download Speed (Actual speeds are lower) | 343 Mbps | 686 Mbps | 1000+ Mbps | 1000+ Mbps | 2500 Mbps |
| Built-in WiFi Router | No | No | No | No | No |
| Gigabit Ethernet Ports | 1 | 1 | 1 | 1 | 1 (2.5 Gbps) |
| Works With Any WiFi Router That Has an Ethernet WAN port | ✓ | ✓ | ✓ | ✓ | ✓ |
| Telephone Ports | No | No | No | No | No |
| What Modem/Router Product is Most Similar to This Modem-Only Product? | Yes, MG7315 | Yes, MG7540 | Yes, MG7700 | None, but works with any router that has an Ethernet WAN port | Yes, MG8702 |
Reviews with images
Very satisfied with the MB8611 after 2 yrs
MB8611 purchased mid 2020 to replace an old Zoom DOCSIS 3.0 modem. Modem has been connected to a Linksys WRT1200ac router running regularly updated DD-WRT firmware since purchase. Both modem/router are sitting behind a small APC battery backup/surge protector (BE600M1). This review is for the MB8611 only and should not be considered valid for the MB8600 or MB7621 nether of which I have purchased/knowledge.The MB8611 was a little higher priced than I hoped but a $50 gift card helped ease the pain. I did lots of research and found the MB8611 was the best fit for my setup and future service upgrades. My Zoom modem was maxed at 343 Mbps DL where as the MB8611 could handle up to 2.5 Gbps which was nearly double what my router can handle. When MB8611 was purchased my service was 100 Mbps, ISP upgraded me to 200 Mbps and with this last ISP upgrade now sits at 300 Mbps. (none of the upgrades were requested)Confirmed all accessories were present so I unboxed and hooked it up. I was surprised to have an active internet connection within a couple of minutes after boot completion. Feeling uneasy about the nearly instant connection I contacted my ISP via phone and went through the process of registering my new modem's MAC address. It may not have been necessary to do so but I felt more confident about a continued connection once my ISP confirmed they saw the new modem and registered the MAC address. BTW, I had checked prior to purchase and found the MB8611 had been newly added to my ISP's list of approved user modems.I was concerned the first couple of weeks but basically have ignored the modem since. After approx 2 yrs I thought I should share my experience. The MB8611's performance has been amazing. The router is rebooted every night but the modem has not been rebooted since purchased. I've had a couple of connection drops but quickly confirmed my ISP was off-line in my area temporarily. With three wired and ten wireless devices the MB8611 has been rock solid. It just works without any intervention from myself. I consider it one of my best investments.The modem sits on top of a file cabinet next to my router. Placing my hands on the sides at the top it is slightly warm and cool at the bottom. I was using QoS on my router but disabled it to try the modem's Active Queue Management (AQM). With no apparent change in performance I left the router QoS disabled. The modem lights are on solid except for the bottom LAN connection light which blinks constantly. That may be a negative for some?I highly recommend the MB8611. It has been the best modem I've owned to date. I have attached a page from the MB8611 manual that explains the lights color/blinking/status. The modem lights image to the right is my modem's appearance connected to a 300 Mb service. I've also added the rear view of the three similar modems to indicate what the MB8611 back view is (left) compared to the other two available on the MB8611 Amazon page.
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